Nissan Maxima. Manual - part 891

PCS-44

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

U1000 CAN COMM CIRCUIT

DTC/CIRCUIT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000010049418

Refer to 

LAN-6, "System Description"

.

DTC Logic

INFOID:0000000010049419

DTC DETECTION LOGIC

NOTE:

U1000 can be set if a module harness was disconnected and reconnected, perhaps during a repair. Confirm

that there are actual CAN diagnostic symptoms and a present DTC by performing the Self Diagnostic Result

procedure.

Diagnosis Procedure

INFOID:0000000010049420

1.

 PERFORM SELF DIAGNOSTIC

1. Turn ignition switch ON and wait for 2 seconds or more.

2. Check “SELF- DIAG RESULTS”.
Is “CAN COMM CIRCUIT” displayed?

YES

>> Perform CAN Diagnosis as described in DIAGNOSIS section of CONSULT Operation Manual.

NO

>> Refer to 

GI-41, "Intermittent Incident"

.

CONSULT Display

DTC Detection Condition

Possible cause

CAN COMM CIRCUIT
[U1000]

When any listed module cannot communicate with CAN 
communication signal continuously for 2 seconds or 
more with ignition switch ON

In CAN communication system, any item (or items) 
of the following listed below is malfunctioning.
• Transmission
• Receiving (ECM)
• Receiving (VDC/TCS/ABS)
• Receiving (METER/M&A)
• Receiving (TCM)
• Receiving (MULTI AV)
• Receiving (IPDM E/R)

PCS

U1010 CONTROL UNIT (CAN)

PCS-45

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

U1010 CONTROL UNIT (CAN)

DTC Logic

INFOID:0000000010049421

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000010049422

1.

 REPLACE BCM

When DTC U1010 is detected, replace BCM.

>> Replace BCM. Refer to 

BCS-79, "Removal and Installation"

.

CONSULT display de-

scription

DTC Detection Condition

Possible cause

CAN COMM CIRCUIT
[U1010]

BCM detected internal CAN communication circuit malfunction.

BCM

PCS-46

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2553 IGNITION RELAY

B2553 IGNITION RELAY

Description

INFOID:0000000010049423

BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned

ON.

• Ignition relay-1 (inside IPDM E/R)

• Ignition relay-2 (inside fuse block (J/B))

• Front blower motor relay

BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.

DTC Logic

INFOID:0000000010049424

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

 PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON under the following conditions, and wait for at least 2 seconds.

-

CVT selector lever is in the P or N position.

-

Release brake pedal.

2. Check “Self diagnostic result” with CONSULT. 
Is DTC detected?

YES

>> Go to 

PCS-46, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010049425

Regarding Wiring Diagram information, refer to 

PCS-103, "Wiring Diagram"

.

1.

 CHECK IGNITION RELAY-2 FEEDBACK INPUT SIGNAL

Check voltage between BCM harness connector and ground under

the following conditions.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-79, "Removal and Installation"

.

NO

>> GO TO 2

2.

 CHECK IGNITION RELAY-2 FEEDBACK CIRCUIT

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2553

IGNITION RELAY

BCM detects a difference of signal for 2 seconds or 
more between the following information. 
• Ignition relay-2 (fuse block (J/B)) ON/OFF opera-

tion

• Ignition relay-2 (fuse block (J/B)) feedback.

• Harness or connectors

(ignition relay-2 feedback circuit is 
open or short)

Terminals

Condition

Voltage (V)

(+)

(-)

BCM

Ground

Connector

Terminal

M18

31

Ignition 

switch

OFF

0

ON

Battery voltage

ALMIA0086ZZ

PCS

B2553 IGNITION RELAY

PCS-47

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

1. Turn ignition switch OFF.

2. Disconnect BCM and fuse block (J/B).

3. Check continuity between BCM harness connector (A) and fuse

block (J/B) harness connector (B).

4. Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness.

3.

 CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> Inspection End.

BCM

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

M18 (A)

31

M3 (B)

2N

Yes

ALMIA0087ZZ

BCM

Ground

Continuity

Connector

Terminal

M18

31

No

ALMIA0088ZZ